Google suggests drawing curtains just means moving them in either direction. Learn something new every day.
How about stick to open and close?
Draw them closed to close them. Draw them back to open them.
Was just about to type this.
1. open the curtains
2. close the curtains
3. Both - either open or close the curtains depending on their current state
What say you GD?
(I've generally used it as meaning 2 though a friend uses it to mean 1 and she's adamant that 2 is wrong)